/**
 * Copyright (C) 2002-2015   The FreeCol Team
 * <p>
 * This file is part of FreeCol.
 * <p>
 * FreeCol is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * <p>
 * FreeCol is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with FreeCol.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.sf.freecol.util.test;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;


public class MockPseudoRandom extends Random
{
    int pos;
    private List< Integer > setNumberList;
    private boolean cycleNumbers;
    private Random random;
    private final float scale = 1.0f / ( float ) Integer.MAX_VALUE;

    public MockPseudoRandom( )
    {
        this( new ArrayList< Integer >( ), false );
    }

    public MockPseudoRandom( List< Integer > setNumbers, boolean toCycle )
    {
        pos = 0;
        setNumberList = setNumbers;
        cycleNumbers = toCycle;
        random = null;
    }

    public void setNextNumbers( List< Integer > setNumbers, boolean toCycle )
    {
        pos = 0;
        setNumberList = setNumbers;
        cycleNumbers = toCycle;
    }

    private int getNext( )
    {
        if ( pos < setNumberList.size( ) )
        {
            int number = setNumberList.get( pos );
            pos++;
            return number;
        }
        if ( cycleNumbers && ! setNumberList.isEmpty( ) )
        {
            int number = setNumberList.get( 0 );
            pos = 1;
            return number;
        }
        if ( random == null )
        {
            random = new Random( 0 );
        }
        return - 1;
    }

    @Override
    public int nextInt( int n )
    {
        int number = getNext( );
        if ( number < 0 || number >= n )
        {
            System.err.println( "MockPseudoRandom out of range: " + number );
            return random.nextInt( n );
        }
        return number;
    }

    @Override
    public float nextFloat( )
    {
        int number = getNext( );
        return ( number < 0 ) ? random.nextFloat( ) : number * scale;
    }

    @Override
    public double nextDouble( )
    {
        int number = getNext( );
        return ( number < 0 ) ? random.nextDouble( ) : number * scale;
    }
}
